Figure 5From: Facile Fabrication of Ultrafine Hollow Silica and Magnetic Hollow Silica Nanoparticles by a Dual-Templating Approach a Nitrogen adsorption–desorption isotherms of S3 and S4. b, c Pore size distribution calculated from adsorption and desorption branch of the isotherms, respectively, using the BJH methodBack to article page